@JC1234 Thank you for reaching out to us on Microsoft Q&A platform. Happy to help!
I understand that you are unable to generate a project key in Azure migrate. This could be permissions related issue. Only owner permission is not enough. You need the following permissions assigned to an Azure user account: https://learn.microsoft.com/en-us/azure/migrate/tutorial-discover-vmware#prepare-an-azure-user-account
Note: The Azure user account that was used to sign in from the appliance configuration manager should be the same user account that was used to generate the Azure Migrate project key on the portal.
Hope this helps. Let us know how it goes!